(19)

(11)

EP 2 183 463 A2

(12)

(88) Date of publication A3: 25.02.2010 (43) Date of publication: 12.05.2010 Bulletin 2010/19 (21) Application number: 08874739.9 (22) Date of filing: 05.08.2008

(51) International Patent Classification (IPC):  E21B 34/10(2006.01) E21B 34/08(2006.01) (86) International application number: PCT/US2008/072198 (87) International publication number: WO 2009/154641 (23.12.2009 Gazette 2009/52)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR Designated Extension States: AL BA MK RS (30) Priority: 09.08.2007 US 836576 (71) Applicant: Baker Hughes Incorporated Houston, TX 77210-4740 (US)	(72) Inventor: GOING, Walter, S., III Houston TX 77055 (US) (74) Representative: Jeffrey, Philip Michael  Dehns St Bride's House 10 Salisbury Square London EC4Y 8JD London EC4Y 8JD (GB)